Question: Who is the  {nuclear weapon} for {designed by} of {Manhattan Project}
Paraphrase: Who is the { nuclear weapon } of the { Manhattan Project }
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P287 wd:Q127050 . ?sbj wdt:P31 wd:Q12802 } 
Answer: The Gadget